Sorry for the slow reply, to explain what happend after the first crash Windows updated and uninsalled/corrupted my video graphic drivers. Now DX11 works flawleslly but Vulkan still crashes randomly. I couldnt find a pattern for the crash sometimes when there is a horde of zombies, other times when I'm just turning aroud. I can't play for more than 1 hour without a crash with Vulkan. Thanks anyway have a great day! (Note:The crashing was not happening before A21)